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graphics/vtkOBBTree.h

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/*=========================================================================

  Program:   Visualization Toolkit
  Module:    $RCSfile: vtkOBBTree.h,v $
  Language:  C++


Copyright (c) 1993-2001 Ken Martin, Will Schroeder, Bill Lorensen 
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.

 * Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.

 * Neither name of Ken Martin, Will Schroeder, or Bill Lorensen nor the names
   of any contributors may be used to endorse or promote products derived
   from this software without specific prior written permission.

 * Modified source versions must be plainly marked as such, and must not be
   misrepresented as being the original software.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS''
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE FOR
ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/
#ifndef __vtkOBBTree_h
#define __vtkOBBTree_h

#include "vtkCellLocator.h"
#include "vtkMatrix4x4.h"

// Special class defines node for the OBB tree
//
//BTX
//
class vtkOBBNode { //;prevent man page generation
public:
  vtkOBBNode();
  ~vtkOBBNode();

  float Corner[3]; //center point of this node
  float Axes[3][3]; //the axes defining the OBB - ordered from long->short
  vtkOBBNode *Parent; //parent node; NULL if root
  vtkOBBNode **Kids; //two children of this node; NULL if leaf
  vtkIdList *Cells; //list of cells in node
  void DebugPrintTree( int level, double *leaf_vol, int *minCells,
                       int *maxCells );
};
//ETX
//

class VTK_EXPORT vtkOBBTree : public vtkCellLocator
{
public:
  vtkTypeMacro(vtkOBBTree,vtkCellLocator);

  static vtkOBBTree *New();

  void ComputeOBB(vtkPoints *pts, float corner[3], float max[3], 
                  float mid[3], float min[3], float size[3]);

  void ComputeOBB(vtkDataSet *input, float corner[3], float max[3],
                            float mid[3], float min[3], float size[3]);

  int IntersectWithLine(float a0[3], float a1[3], float tol,
                        float& t, float x[3], float pcoords[3],
                        int &subId);

  int IntersectWithLine(float a0[3], float a1[3], float tol,
                        float& t, float x[3], float pcoords[3],
                        int &subId, int &cellId);
  
  int IntersectWithLine(float a0[3], float a1[3], float tol,
         float& t, float x[3], float pcoords[3],
         int &subId, int &cellId, vtkGenericCell *cell);

  //BTX
  int DisjointOBBNodes( vtkOBBNode *nodeA, vtkOBBNode *nodeB,
                        vtkMatrix4x4 *XformBtoA );

  int LineIntersectsNode( vtkOBBNode *pA, float B0[3], float B1[3] );

  int TriangleIntersectsNode( vtkOBBNode *pA,
                                     float p0[3], float p1[3],
                                     float p2[3], vtkMatrix4x4 *XformBtoA );

  int IntersectWithOBBTree( vtkOBBTree *OBBTreeB, vtkMatrix4x4 *XformBtoA,
                            int(*function)( vtkOBBNode *nodeA,
                                            vtkOBBNode *nodeB,
                                            vtkMatrix4x4 *Xform,
                                            void *arg ),
                            void *data_arg );
  //ETX

  void FreeSearchStructure();
  void BuildLocator();

  void GenerateRepresentation(int level, vtkPolyData *pd);

  //BTX
protected:
  vtkOBBTree();
  ~vtkOBBTree();
  vtkOBBTree(const vtkOBBTree&) {};
  void operator=(const vtkOBBTree&) {};

  // Compute an OBB from the list of cells given.  This used to be
  // public but should not have been.  A public call has been added
  // so that the functionality can be accessed.
  void ComputeOBB(vtkIdList *cells, float corner[3], float max[3], 
                       float mid[3], float min[3], float size[3]);

  vtkOBBNode *Tree;
  void BuildTree(vtkIdList *cells, vtkOBBNode *parent, int level);
  vtkPoints *PointsList;
  int *InsertedPoints;
  int OBBCount;
  int DeepestLevel;

  void DeleteTree(vtkOBBNode *OBBptr);
  void GeneratePolygons(vtkOBBNode *OBBptr, int level, int repLevel, 
                        vtkPoints* pts, vtkCellArray *polys);

  //ETX
};

#endif

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